Hi, I`m new to Mikrotik and have a problem getting an VLAN from one box to another.

My setup:

A RB750 connectet on Ether 2 through a switch with a RB450 on Ether 1

I have cofigured everything according to this Application Example, but am not able to ping from one box to another,
http://www.mikrotik.com/testdocs/ros/3.0/vpn/vlan.php

Do I need to configure anything else?

That's just a link to a generic manual, so it's impossible to troubleshoot your two specific routers based on that information.

Please post the output of "/ip address print detail", "/interface print detail", "/interface vlan export", "/ip route print detail", and "/ip firewall export". Also post a detailed network diagram.

Is the switch you're using VLAN capable?